Blasting cartridge



@mit H3, lg, F. H. KNEELAND BLASTING CARTRIDGE Filed O MWMVI. ,Mmmmmwmwww uhhh?. N

Patented ct. i3, 1931 UN IT D STATESq PATENr OFFICE f FRANK E. D, F CHICAGO, ILLINOIS, ASSIGNOB TO SAFETY MINING' COMPANY, 0F CHICAGO, ILLINOIS, A. CORPORATION BLASTING CARTRIDGE Application me@ October 19, 1929. Serial No. 400,838.

This invention Iis concerned with an improved blastin device intended for use with the ordinary orms of explosives. It is a matter of common knowledge that the use of such explosives in accordance with current practice in mines is dangerous and this is ,particularly true of gaseous mines. It is also well' known that the actionof such ex-v plosives on some substances, such as coal, isVY objectionablyy severe in thatf the product is badly shattered. Y

v An object of the present invention is to 10 provide a blasting device with which any of the ordinary forms of explosivesI may be used but without the objectionable results pr uced by such explosives when used in accordance with current practice. Y Specifically, it is an object of the invention to provide an improved blastin device 2n employing an ordinary explosive an in the severity of the explosion is reduced to a minimum. i

It is also an object of the invention to provide a blasting device of the character indias cated and wherein means are provided for the purpose of reducing the danger of mine ex losion or tire.

the drawing, v The single igureis a view in longitudinal section of a blastingf device embodying my invention. i

The method and apparatus of the present invention consists essentially of the use of an explosive medium in conjunction with al body of substantially incompressible fluid in such a way that the force of the explosio is caiised to act through the body of fiuid and the llame resulting from the explosion is substantially quenched by the uid. The particular structure shown in the drawing comprises an indestructible cylinder 1, having a cap 2 secured over one end thereof. Themterior of the cylinder is designed to receive a charge of any desired explosive such, for

example, as black powder and an electric squib or matchhead 4is provided to ignite the same.

squib extend outwardly throughan aperture 5 irrthe cap 2. The opposite end of the cy 5o inder is provided with a shoulder 6 on which where-- mized by the ody of iiuid and second, that -lic body The leads from the matchhead or is seated a water proofplug or waldding 7. The open end of the cylinder is enclosed by a container 8 whichl may be secured to the end of the cylinder by means of suitable clamping bands 9. The container 8 is so constructed and designed that it will' rupture in response to a predetermined pressure and for this purpose the container may be formed of a heavy fabric n'or any suitable light metal. The contalner is adapted to b'e substantially illed with an incompressible 'luid as indicated at In the use of a cartridge as above described, the entire device including the indestructible charged cartridge 1 and the rupturable luid 65 container 8 is inserted in the bore hole formed in the material to be blasted. After being properly positioned and tamped in lace, the leads from the squib or ln-atchhea `may be connected to any suitable blasting device and thecartridge fired in the ordinary way. The result of ignition of the explosive will blow out the disc 'or wadding 7 and discharge the gases resulting from the combustion ofthe explosive directly into the body of fluid with-A in the container 8. Thus, the container 8 willy be ruptured by the increase in pressure therein and the force of the explosion will be exerted upon the l material to vbe blasted hrtugh the medium of the liberated body of The outstanding-advantages of a blasting device as herein described are first, that the shock resultin from the explosion is minithe uid serves to quench whatever iame may be produced by the combustion of the explosive material.

I claim:

1. A blasting cartridge comprising a metalhaving a chamber open at one end and adapted to be filled with an explosive, a fluid container secured to the open end of said bdy, and a ru turable closure for the open end of said bo y to separate the interior of said container from said chamber.

2. A blasting cartridge comprising an indestructible cylindrical body adapted to be charged with an explosive, an indestructible closure for one end osaid body, a rupturable 100 water proof plug for the other end of said body, and a rupturable Huid container having an open end extending over and secured to the last mentioned end of said body.

Signed at Chicago, Illinois, this 17th day of October, 1929. t

FRANK H. KNEELAND. 

